Perpetual calendar.



PATENTED MAY 28, 1907.

H. V. VOGT. PERPETUAL GALENDAR. APPLIOATION FILED SEPT. 12, 190e.

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1 .mrnmm m $01.41 l R E...v. DMW .LN s vAEF m ULHH ATc E C N u 0T PVIMHRL n EHVIW TNG P N A m O N Rn Mmm B THE CALENDE FOR PRESENTMONTH 0R FORANY FUTURE CENTURY ANY PAST MONTH BEGINNIN /N VE /V 70H No. 855,078.PATENTED M AY 28, 1907.

l H. V. VOGT.

PERPETUAL CALENDAR. APPLIoATIoN FILED SEPT. 12, 1906.

WIT/visse@ l v 4 ws/wan 110.855.078. PATBNTED MAY 2a. 1907.

H. V. voGT. PBRPBTUAL CALENDAR.

APPLICATION FILED SEPT. 12, 1906.

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PE R PE TUAL MONTHLY-CALENm-:R

BEGINNING/ WITH THE HRISTI^II ERA.

PERPETUA L MONTHLY-CALENDER FOR ANY MUNTH FOREVER BEGINNING WITH THECHRISTIAN ERA.

UNITED STATES PATENT OFFICE.

Specication of Letters Patent.

' 'Patented may as, 1907.

Application mea Septante: 12, 190e. serial No. 334,206.

, calendar having a fixed part and a movable part and data arranged onbzoth parts in such manner that by the mampulation of the movable partso as to register certainrdata thereon with certain data on the iixedpart, the calendar may be set for any given month of any given year fromthe beginning of the Christian era to the end of time.

.In the drawings: Figure 1 is a'ront elevation of the card forming thefixed part of the calendar; Fig. 2'is a similar view of the revolubledisk forming the movable part of the calendar; Figs. 3 and 4 are.similar views of the calendar, partly broken away, illustrating themethod of using the same.

' Near the center of the card X is a circle a, to the center c of whichis, ivotally attached the revoluble disk Y. T e card X is rovided, nearits upper end, and outside o the circle a, with a segmental oriiice babove which are the names of the week; Below the oriiice b, and alsooutside of the circle a, is another se ental orifice d subtending arcequal to tlt subtended by oriiice b, both arcs being taken from thecenter c. At the side of oriiice d is the word Months Above the oriiiced are certain letters, A, G,

' F, E, D, C, B, known as month key-letletters. Anther segmental oriicee, outters. At the side of thel space containing these letters A.are thewords, Month keyside ofr the circle a, subtends an arc diii'erent fromthe arcs subtended by orifices b, andd and at a distance from the radiusdiierent romthat atwhich `ol'iiices bA and d arelocated. At the sid ofthe orifice e are the words Dominical key-letter.

Within the circle a is formed another stiegmental orifice j; whichsubte'nds an arc ferent from vthe arcssubtended by the other orifices. At the side of oriiice f of the circle is divided'into three' `segmentals aces, g, h and -'i,1ocated at respectively different distances. fromthe center of the circle. The yspace- ;g contains words company/.ingdrawings, which form a part of all,

the segment 'Old style Julian centuries. The spaceh contains the wordsNew style Gregorian. The space i contains the Words Perpetual key. Abovethe oriiice f are the words Century table. In the unoriiiced upper halfof the circle a are placed words indicatin the character of thecalendar.

elow the circle a and the oriiicef therein is arranged a year table lcdivided into seven vertical columns, the year table containing the yearsof any given century properly arranged .in the several columns. The leapyears are indicated by a star.

On one side of the year table is aspace containing directions .forsetting the calendar. On the other side of the ear table is a spacecontaining directions perpetual key-numbers.

The revoluble disk Y is provided with four concentric spaces m, n, o andp located at diierent distances from the center of the disk and adaptedto register respectively with the .orifices l), e, d and jl The space mis provided with spaces having numbers indicating the days of the or thelmonth, thenumbers being divided into radial columns of either four orve numbers, and seven of the. columns be adapted, at zany. givenposition of the dlilsl, toregi'ster with the oriiice b and respectivelywith the days of the week above the orifice b. `For convenience, thedisk Y is notched between each two adjacent columns.

The space mis provided with sub-spaces containing letters A, B, C, D, E,F and G, which I call Dominical of these lettersjs adapted, at any givenposition of the disk, to iice e.

The space o is rovided with sub-spaces in which are properlp months, twoof the spaces containing the names February and January associated withstars indicating that the months referred to are those occurring in leapyears.

Seven of the sub-spaces of space o are adapted, at any -The space p isrovided with radial columns of igures in 'eating the century numbers'from 1 to 22 inclusive. The space p' is also divided into threeconcentric sub-spacesv p1 p2 and p3. Seven vof these columns areadapted, at anygiven position of the disk, yto register with the sevencolumns of the year key-letters. One

register with the ori-A Y ven `position ofthe disk Y, to'` registerwitthe orifice d and respectively withthe month key-letters above theoriiice.

y arranged the names of the IOO IIO

century number must'befound in sub-space I5 P l. If the monthly calendarwanted is accordingto the new style Gregorian calendar,

"then the desired century number must be foundin sub-space 2. When thedisk is turned to the descri ed position a certain Dominical key-lettercontained in one of the sub-spaces of s ace n will show through orificee. The dis r is then turned until the desired month in one of thesub-spaces of space o registers witha monthkey-letter corres onding tothe said Dominical key letter.

his gives a correct calendar for the particular month of the particularyear desired.

For example, if it is desired to provide a monthly calendar forDecember, 1906, the disk is turned, as indicated in Fig. 3, until theradial column containing the number 19 in sub-space p2 of the diskregisters with the vertical column containing 06 in the ear table c. AsWill be seen, the Dominical eyletter in thisposition of the disk is G.The disk is then turned until the sub-space of space o containing theabbreviation Dec registers with themonth key-letter G, as

shownl in Fig. 4. This gives the correct calendar for'December, 1906.

ln certain instances it may happen that when the disk is moved tol causethe century number to register with the year'number, the disk will be insuch position that the desired month on the disk registers with themonthkey letter corresponding to the Dominical key-letter. ln such acase, a second movement ofthe disk is unnecessary. or example, if'itdesired to provide a calendar for Uctober, 1906, and the disk is turnedto cause the century number to register with the ear number; as beforedescribed,and as i lustrated in Fig. 3, thecharacter Oct on the diskregisters with the month-key letter G corresponding to the Dominicalkey-letter G, thus providing the proper calendar for October, 1906without a second movement of the disk. A 1f' thecalendar for `anyparticular month of any year later than 22229 is desired, the cen- -turyshould be divided by 4, the remainder (whichwill be either 0, 1, 2 0113)indicating the key number in space p3 which should be registered withthe column, in the year table, containing the desired year. y thismeans,

seams the proper Dominical key-letter is ascertained.

It will be understood that the year 00 in any given century is'always aleap year when combined with a Julian century, but when making acombination with a Gregorian century it is a leap year only whendivisible by 400. The year 00 in the year table is associated with twostars, which indicates that any given year in the Gregorian calendarending in 00 is a leap year only when its Dominical key-letter is A, asthis combination can only register the key-letter A but once in 400years.

Having now fully described my invention, what I claim and desire toprotect by Letters Patent is:

1. A perpetual calendar comprising a fixed .card having four orificesand a movable card having spaces containing respectively figuresindicating the days of a month, Dominical key-letters, charactersindicating the months of a year, and a table of century numbers, saidspaces registering with said orifices respectively, said disk alsocontaining a year table adjacent to the orifice with which said centurytable registers, and a series of month key-letters adjacent to theorifice registering with the space containing said month characters.

2. A perpetual calendar comprising a fixed c ard having an orifice andcharacters indicating the da s of the week adjacent thereto, a secondori ce and monthkey-letters adjacent thereto, a third orifice and atleast two spaces adjacent thereto, a fourth orifice, and a tablecontaining year numbers; and a movable card having a s ace containingfigures indicating the da s ofp the month and adapted to register with te rst orifice, a second space containing characters .indicating themonths of a year adapted to register with the second orifice, a thirdspace having two sub-spaces containin century numbers adapted toregister with t e third orifice, the year table, and respectively withthe said two spaces of the fixed card, and a fourth space containingDominical ke -letters adapted to register with the fourt orifice.

3. A perpetual calendar comprisin a fixed card having four orifices anda movale card having spaces containing respectively figures indicatingthe days of a month, Dominical key-letters, characters indicating themonths of a year, and a table of century numbers and .perpetual ke-numbers, said spaces registerloo los,

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l second orifice and month key-letters adjacent thereto, a third orificeand three spaces adjacent thereto, a fourth orifice, and a tablecontaining year numbers; and a movable card having a space containingfigures indieating the days of the month and adapted to register withthe first orifice, a secondspace containing characters indicating themonths of a year adapted -to register with the second orifice, a thirdspace, adapted to register with the third orifice, having threesub-spaces containing two sets of century. numbers and perpetualkey-numbers all adapted to register with the year table and also adaptedto register respectively with the three s aces of the fixed cardadjacent to the third)orifice, and a fourth space containing Dominicalkey letters adapted to register with the fourth orifice. V

5. A per etual calendar comprising a revoluble disk aving fourconcentric spaces'ar ranged about a common center, one space containingradial columns of figures indicating the days of a month, another spacecontaining a series of Dominical key-letters, another space containingcharactersindicating the months of a year, and another space containinga table of numbers indicating centuries; and a fixed card to which therevoluble disk is pivoted at said common center, said fixed card havingfour orifices located at radial distances from said common centercorresponding to the radial distance from said common center of saidfour spaces so as to respectively register therewith, said fixed cardalso having a year table adjacent to the orifice registering with thespace containing the century table, and month key-letters adjacent tothe orifice registering with the space containing the month characters.

6. A monthly calendar comprising a fixed card and a revolublel diskpivoted thereto, said disk having four spaces concentric with said pivotpoint, one space being divided into sub-spaces containing radialcolumnsof figures representing the days of a month, a second space beingdivided into sub-s aces containing Dominical key-letters, a t iird spacebeing divided into sub-spaces containing characters indicating themonths of a year, and a fourth space containing radial columns offigures indicating century numbers, said fixed card having an orificeadapted to register with the first space of the disk and sub stantiallycorresponding in length with the Vlengthofl seven sub-spaces of thefirst space,

a second orifice adapted to register with the second space of the diskand substantially corresponding in length With the length of onesub-space of the secondL space, a third orifice adapted to register withthe third space of the disk and substantially correspondingin lengthWiththe length of seven sub-spaces of the third space, and a fourthorifice ada ted to register with the fourth space of t e disk andsubstantially correspending in len th with the Width of seven columns ofthe ourth space, said fixed card also havin seven columns indicatingyear numbers a apted to register with seven successive columns of thefourth space of the disk, and seven spaces containing seven monthkey-letters adapted to register with seven successive sub-spaces of thethird space of the disk.

7. A perpetual calendar comprising a movable card containing columns offiguresindi eating century numbers, a fixed card containmg columns offigures lndlcatmg year numbers, the movable card'being adaptedto-bemoved to cause one of the century columns thereon to re ister withone of the year columns on the ed card, there being Dominicalkey-letters one foreach combination of year column and century columnthus adapted to be registered, means indicating the proper key-letterwhen said combination of year column and century column is thusregistered, the fixed card containing a series of month key-letterscorresponding to said Dominical key-letters, and the movable cardcontainin a series of characters indicating the Inont s of theyear, saidmovable card being movable to register one of said month characters withone of said month'key-letters the fixed card containing a series ofcharacters indicating the days of the Week and the movable cardcontaining a series of columns of figures indicating the days of themonth, seven of the last' named columns registering respectively withseven of the last named characters when the movable card is moved toregister its month characters with one of the month keyfletters of thefixed card.

ln testimony of which invention, I have hereunto set my hand, atPhiladelphia, on this 10th day of September, 1906.

yHARRY V. VOGT.

lNitnesses I IUGH BmTToN, JNO. VV ALLAcE.

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